Joseph m



45 The steel *should'be poured as soon as'the STATES PATENT OFFICE. JOSE?! at. rnamtnnr, or rrrrsnuherr, rmsrnvma, assrenon osmnoan comm, or rrr'rssnscn, Immsrnvanu.

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To all whom it may omcern: 2

Be it known that I, Joanna M.-Fr.armnar, a of the United States, and a resident of Pittsburgh ghen and State oi Pennsylvania, have invented certain new and useful Im rovements in High-Speed Steel; and I do. ereby declare the followin to be a full, clear, and

- exact-description o the invention, such as steel mal absorption as will enhance the efliciency of the metal when used as cutting steel in the art of metal cutting,than heretofore been accomplished.

A further object isto produce a high speed steel, in which 'a hardening and toughemngmaterial shall be used, wh1ch.shall also act, e'fi'ectually as a deoxidizing and denitr'ogenizing a t. t

v .A further object is to decrease the cost of manufactu high speed steel, and at the same time ancing the efiiciency of the having same p With these and other objects in view, the

invention consists in a high speed steel such as hereinafter described and defined in the claims.

The invention further consists in steel uranium incorporated therein and constituting the sole ,added hardening,

' toughening and thermal absorption agent 40.

necessary to form high speed steel.

The "may be incorporated into the steel in the form of 'ferrt'r'uranium, or uranium metal may be employed. I prefer to add the uranium from five to ten utes before pouring, and after de-slagging.

uranium alloy or uranium metal has melted which may require from five to ten mmutes. Less time-will be requiredior the in the county of Allaadds materiallygto the cutting the steel, and that brittleness isreduced to Bpecfleedon arran er-lent. Patented Jan. 2, 1917. a unaaennea rm iaiaic. Sc -MRO. 79,430.

melting nd. alloying of the uranium with so the steel if an electno;- furnace be employed, rather than a crucible;

If prefer to employ form-uranium or uranium metal in such quantity, that the fin-' ished steel shall contain a proportion of uranium as great as five per cent. or from .06oto'5%'.

have found that high speed steeLcontaining-uranium-in the proportion substantiall as stated, possesses qualities ofgrhat 6.0

har ess and toughness; that the uranium 'impartsto the steel thatquality of thermal absorption which, in conjunction with hardness and toughne ss, renders thesteelveryj eflicient for use as tool steel in the art of metal cutting.

ldhavgizfigund ding thizrgiranium acts, as aeoxi gan"enigen1z1n" aenthereby increasing'the strength andfiuct ili as "well as heat resisting qualities; that 1t' qualities of a minimum. o

The alloy' ma be crushed to the desired size and applie to the molten mass while pouring-in the ladle, or after themolten mass is in the ladle. .It may also be applied in the crucible or furnace.

" HlgBIEQeSIPQBd steels as is well known comprise s ofvarious compositions, to which some element has-been added to plrjoduce the qualities necessary to produce h speed steel. Heretofore, tungsten has icon the usual added element. The characterof the n steel to which said other element has been 8 added has varied considerably.

' This invention contemplates the em idoyl;

ment of uranium to speed Qualities.

Having fully whatl claim as new and desire to secure by Lette impart to steel,

rs-Patent, is:-

1. High sgeed steel containing uranium. as the sole a dad toughening agent;

2. Steel having uranium mcorporated therein and constituting the sole added element necessary to form high speed steel. I

3. High speed steel comprising steel havdescribed my invention I Q v 1,210,?25 I i1 1'g uranium alloyed therewith in the prospecificatioh in' the presence of twd sub- POIfiOHD. a proxicinatellylfs speciflifd. dth scribing witnewes.

4. ig spee stee avin :1 eye era'- Y with as the'sole added toug en-ing agent, .a. v JOSEPH FLANNERY' 5 proportion of uranium gs ranging from .05 Witnesses:

per cent. to 5 percent. WILLIAM GANLEY,

In testimony whereof, I have signed this H. BJKEARNEY; 

